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DURBAN, South Africa--By 2020, human activity could produce some 55 billion metric tons of greenhouse gases per year, up from roughly 36 billion metric tons per year currently. All the accumulating gas is enough to raise the global average temperatures by more than 3 degrees Celsius by century's end--more than triple the amount of warming that has already occurred. Emission reductions pledged under the Cancun Agreements , which cover some 85 percent of all national greenhouse gas emissions in the world, are meant to slow that warming.
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